| ERROR | TNS: no such protocol adapter |
| CAUSE | The protocol adapter requested (by way of the (PROTOCOL=..) keyword-value pair in a TNS address) is unknown. If the supplied address is typographically correct then the protocol adapter is not installed. |
| ACTION | Install the protocol adapter or correct typographically error, as appropriate. Note: if the supplied address was derived from resolving the service name, check the address in the appropriate file (TNSNAMES.ORA, LISTENER.ORA or SQLNET.ORA). |
| 654717 | Composite SAP Note: ORA-12538 |